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通过对Q460高强钢进行单向拉伸与反复加载下材料性能试验,得到了各试件单调拉伸和反复加载下的应力-应变关系曲线,以及反复加载下的骨架曲线,并将试验结果与文献研究结果进行了对比。试验结果表明:单向拉伸材性试验中,11 mm厚Q460C高强钢板的平均断后伸长率为23.7%,屈强比为0.847;21 mm厚钢板的平均断后伸长率为30.4%,屈强比为0.792;Q460钢的循环硬化程度比Q345钢明显减弱,主要原因是随着钢材强度的提高,钢材的屈强比增大,钢材的应变强化效应减小。根据钢材反复加载的滞回曲线,提出了Q460高强钢材的应力-应变滞回模型,用该模型计算得到的关系曲线与试验曲线对比,两者吻合较好。
Through the uniaxial tension and repeated loading of Q460 high strength steel, the stress-strain curves under monotonic stretching and repeated loading of each specimen were obtained, and the skeleton curves under repeated loading were obtained. Literature research results were compared. The results show that the average after-break elongation of 11 mm thick Q460C high-strength steel is 23.7% and the yield ratio is 0.847 in the uniaxial tensile test. The average after-break elongation of 21 mm thick steel plate is 30.4% The strength ratio of Q460 steel is weaker than that of Q345 steel, the main reason is that as the strength of steel increases, the yield ratio of steel increases, and the strain hardening effect of steel decreases. According to the hysteretic curve repeatedly loaded by steel, the stress - strain hysteretic model of Q460 high strength steel is proposed. The calculated relationship curves and test curves are in good agreement with each other.